def usage
puts"cewl 2.0 Robin Wood (dninja@gmail.com) (www.digininja.org)
Usage: cewl [OPTION] ... URL
--help, -h: show help
--depth x, -d x: depth to spider to, default 2
--min_word_length, -m: minimum word length, default 3
--offsite, -o: let the spider visit other sites
--write, -w file: write the output to the file
--ua, -u user-agent: useragent to send
--no-words, -n: don't output the wordlist
--meta, -a: include meta data
--email, -e: include email addresses
--meta-temp-dir directory: the temporary directory used by exiftool when parsing files, default /tmp
-v: verbose
URL: The site to spider.
"
exit
end